4cyc toyotas are also legendary for value stem seal leaks in your brothers mileage range .
Does he have higher consumption of oil lately?
I'd guess valve stem seals and or rings gunked.
Check the PCV system -since added pressure will
push oil past worn valve stem seals at a higher rate and be more visible.
Other choices are autoRX, thicker oil. Even HM same grade is thicker. 15/40 delo is a bigger jump for thicker but you can do that in AZ. Delo packs do clean better but at this point AutoRX has the edge since you can see the problem.
I usually do all of the above and then a compression test if its not controlled and change the plugs along with the test.
Does he have higher consumption of oil lately?
I'd guess valve stem seals and or rings gunked.
Check the PCV system -since added pressure will
push oil past worn valve stem seals at a higher rate and be more visible.
Other choices are autoRX, thicker oil. Even HM same grade is thicker. 15/40 delo is a bigger jump for thicker but you can do that in AZ. Delo packs do clean better but at this point AutoRX has the edge since you can see the problem.
I usually do all of the above and then a compression test if its not controlled and change the plugs along with the test.